The nonagricultural land capability class is described as being?

The nonagricultural land capability class refers specifically to lands that are not suitable for farming due to their inherent limitations, such as steepness or poor drainage conditions. When assessing land capability, characteristics such as slope and water saturation play critical roles in determining usability for agriculture.

In this context, identifying land as "very steep or swampy bog" accurately describes areas that have severe limitations for agricultural purposes. Very steep lands can lead to erosion and are difficult to cultivate, while swampy bogs face challenges such as saturation, hindering crop growth and making them less viable for agricultural use.

By contrast, lands classified as moderately sloping, steep, or nearly level do not encapsulate the extreme limitations associated with nonagricultural capability. Moderate slopes may still support certain crops, steep land may be usable under specific conditions, and nearly level terrain is often highly productive agriculturally. Thus, the identification of very steep or swampy bog as the correct answer highlights the significant constraints that define nonagricultural land capability classes.